When would you use the Observer design pattern?

  • When an object's state change should notify its dependents
  • When complex object creation is abstracted and centralized
  • When objects should be able to change behavior at runtime
  • When there is a one-to-many dependency between objects
The Observer design pattern is used when there is a need for a one-to-many dependency between objects, where one object's state change should notify and update multiple other objects. This pattern is commonly used in event handling systems and UI frameworks.
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